Transaction not yet indexed

1iSFkfFe5PqTzCbooMQbQJbnd46u9zk3FeBA1k6DyPhU9PRcQiZMP2KyKhDXvpgRap1k2AoXqNhbXRYy8ZWhat5

The transaction signature is valid but not yet indexed by this RPC node, or the transaction failed before inclusion.